One Illegal German Casino Ring Took €5.86bn, Reopening the Black Market Row

Frankfurt prosecutors say five suspects ran unlicensed slots sites since 2021 and evaded €77.6m in tax in a single year. The regulated industry says a network this size makes the GGL's 23% black market estimate impossible.

• More than 100 officers searched 11 properties in the Rhine-Main region and Cologne on 8 September and executed an arrest warrant against a main suspect, the Frankfurt public prosecutor's office said the following day
• Five suspects are accused of offering unlicensed online gambling on a commercial and organised basis since at least July 2021; stakes of about €5.86 billion passed through the platforms between July 2021 and the end of 2023 alone
• Investigators put the gambling tax evaded in 2024 at about €77.6 million, secured assets worth about €82 million, seized several luxury vehicles and garnished bank accounts
• The German Online Casino Association (DOCV) says the figures "do not fit" the Gemeinsame Glücksspielbehörde der Länder (GGL) estimate of a 23% black market share and €547 million of illegal GGR in 2024, against Nielsen data pointing to about 56%
• The DOCV is calling for a nationwide licensing model for online casino games and for the criminal code's gambling offences to be rewritten so that the place of the crime is where the player sits

A Three-Year Investigation Ends With a Number Nobody Expected

German investigators have dismantled what prosecutors describe as one organised group running unlicensed online gambling sites, and the scale of the stakes involved has turned a routine enforcement announcement into an argument about how big Germany's black market really is.

The Frankfurt public prosecutor's office said on 9 September that a joint operation with the Frankfurt tax investigation office, the Frankfurt police headquarters and North Rhine-Westphalia's state office for combating financial crime had searched 11 residential and commercial properties the previous day, concentrated on Frankfurt and the wider Rhine-Main region, with searches also in Cologne. More than 100 officers took part and an arrest warrant issued by the Frankfurt district court was executed against one main suspect. Four further people are under suspicion.

According to the prosecutors, the group is accused of offering unlicensed online gambling on a commercial and gang basis since at least July 2021, without the German permit that has been required for virtual slot machines since the 2021 State Treaty on Gambling. Between July 2021 and the end of 2023 alone, stakes of about €5.86 billion are said to have been processed through the illegally operated platforms. The suspects are also accused of paying no gambling tax, or not paying it in full; the tax loss for 2024 alone is put at about €77.6 million on the investigation so far. Investigators secured assets totalling about €82 million, including several high-value vehicles, and garnished various accounts. Prosecutors have not named the suspects or the websites. The investigation ran for more than three years, according to the DOCV.

The Regulated Industry Turns the Figures on the Regulator

The German Online Casino Association welcomed the operation and immediately used it against the regulator's arithmetic. In its 2025 activity report, the GGL estimated that unlicensed operators held about 23% of the online market in 2024, equivalent to roughly €547 million in gross gaming revenue. Nielsen data cited by the DOCV puts the illegal share at about 56%.

"Without question, this operation is a success. But it also shows that the illegal online gambling market is flourishing and the scale that organised crime has reached in it," said Kevin O'Neal, a member of the DOCV's executive committee. "The figures from the investigation do not fit with the authority's estimates. This discrepancy is too large and must be explained by the GGL. Its figures paint too small a picture of the black market." Casino.org notes that the alleged network's stakes averaged about €2.34 billion a year over the 30-month period, against roughly €4.57 billion of stakes across Germany's entire regulated online slots market in 2025.

The DOCV drew two policy conclusions. Virtual slots and online poker are regulated federally under the State Treaty, but online casino table games are a matter for the individual Länder, which have issued almost no concessions; the association says that is why casino table play happens "almost exclusively in the black market" and wants the treaty's evaluation to produce a nationwide licensing model. It also wants sections 284 and following of the criminal code, written for land-based gambling, updated so that the place of the offence is the player's location in Germany, alongside payment blocking, geo-blocking, network blocks and cooperation with search engines on advertising.

Stakes Are Not GGR, but the Gap Is Still Too Wide to Wave Away

The DOCV's comparison needs a caveat the association did not volunteer. The €5.86 billion is turnover, the money staked, and slots recycle stakes many times over; the GGL's €547 million is gross gaming revenue, what operators keep. At a typical online slots hold, €2.34 billion a year in stakes is perhaps €80 million to €120 million in GGR, and one network at that size would be a fifth of the regulator's entire black market estimate on its own. That is the point that survives the caveat. Prosecutors found this group through a tax investigation, not a market survey, which means the GGL's model either did not see it or counted it at a fraction of its size, and there is no reason to assume it was the only one. A 23% figure that has to absorb a single €80 million-plus operator looks less like a measurement and more like a floor.

The Enforcement Was a Tax Case, and That Is the Lesson

What broke this network was not the gambling regulator's blocking powers but the Frankfurt tax office's interest in €77.6 million of unpaid gambling tax and a three-year financial-crime investigation with the resources to seize €82 million. That is the model the DOCV is implicitly asking for when it demands that section 284 be rewritten around the player's location: a criminal offence that prosecutors and tax investigators can pursue, rather than an administrative breach the GGL can only try to block at the network edge. It is also the model the Dutch regulator's chairman described this week as missing across Europe: an investigative capacity to match operators who change legal identity faster than fines can be collected. Germany has just shown what that capacity finds when it looks. The awkward question for the GGL is how much more is there.

One case has produced a number larger than the regulator's estimate can comfortably hold. The GGL's next market report will be read against it.